body{
    background: #2D3A4B;
}
.login-box{
    width: 770px;
    height: 450px;
    text-align: center;
    /* 上下边距200px,左右自动对齐 */
    margin: 200px auto;
}
.login-box h1{
    color: #fff;
}
.username{
    width: 740px;
    height: 65px;
    margin-top: 70px;
}
.form{
    width: 740px;
    height: 65px;
    margin-top: 50px;
}
/* class + 标签 > id */
.form input{
    width: 720px;
    /* 输 */
    padding-left: 20px;
    height: 65px;
    border:0;
    font-size: 20px;
    /* 轮廓 */
    outline:none;  
}
/* calss + id > */
.form #login{
    width: 740px;
    padding-left: 0px;
    height: 65px;
    font-size: 26px;
    font-weight: 700;
    background: #02B7FE;
    color: #fff;
    /* 设置边框四个角为圆角 */
    border-radius: 6px;
    /* 设置指针放到上面变成手的样子 */
    cursor: pointer;
    border: none; 
}

